Malicious PDF — malware analysis report

Static analysis result for SHA-256 041faebf4adcce5d…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 11:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eae62c0660e7354a427cb05ad895a823 SHA-1: f83f1b54159c71ba1113f704cce252e46ffb29f7 SHA-256: 041faebf4adcce5d05bc0fdd677a00f3b194899a49c79fa2b4fd9e263c50063f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a single image and minimal text, typical of a screenshot designed to hide clickable links. The document hosts a farm of external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of multiple external links indicates a likely attempt to download further payloads or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://dobrejaja.com/Upload/file/jetokuzasirewi.pdf In PDF document text
    • https://classykitchen.pl/web/uploads/files/12414779186.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/zinofule.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/82907873720.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/dufurunedawagas.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/timesukutizawog.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/bajamulawegudupoxude.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/6974af1f7c5fc37e6815a0a73cbc2759/49233819088.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/tuzaxi.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021091304203173499.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/90566299748.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16149347c27d52---12709286989.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/50236767571.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136dda639955---risolofoma.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/afdcd4be6a19bdb0943c423135c184b7/45685952338.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/xixunobupajipobom.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/58787841473.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/62898881901.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/safejukabufiripiguw.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/fe30b02be3257942e04c3ad54622f8ab/7636703359.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/33425097083.pdfIn PDF document text
    • http://atek-ent.com/upload/file/82169741747.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/13117913318.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/69947868151.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/68150681447.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/49764600266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=gyroscope+pubg+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA12 14140 bytes
SHA-256: 16e89c38fa093af42a92ca6a981d105e6fbe7b36968890e87f4940e4ae9d83ec
font_02_sfnt_off0000ed41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED41 10692 bytes
SHA-256: 1d6243a01a6a64c5fab63f4bcf186f012b980cf35d7937e84bcd9ebe19267b13

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